NOT FOR SALE IN THE UNITED STATES
The Multi-channel STG System offers the following unique capabilities:
This product consists of electronic stethoscopes embedded in foam padding for application to the patient, a signal conditioning box, analog to digital converter and a standard PC with sophisticated software developed by Stethographics.
The Multi-channel STG System provides lung sound information in three principle ways. First, the recorded lung sounds are displayed in a time-expanded waveform, which allows visual examination and audio playback of the data. The display of the traces, similar to an EKG, allows direct visual detection of the abnormalities. Each channel can be examined for crackles, wheezes, and irregular patterns of inspiration and expiration. Contrasts between abnormal data and data recorded for healthy individuals is pronounced.
Second, the computer automatically analyses acoustic energy vs. time and detects crackles, wheezes and rhonchi. Derived measures of the sound characteristics are displayed on an anatomical diagram to allow visualization of the spatial distribution of lung function and abnormalities. Further information on the overall amplitude of breath sounds, timing of the abnormalities, and crackle and wheeze counts is included in this display. Differences in abnormal patterns among different diseases become apparent in this context.
Finally, Stethographics' "automatic localization of intrathoracic sounds origin" technology is used to integrate information from multiple channels to generate a CAT scan type of screen with crackles and wheezes localized to specific lung regions. Advanced visualization software allows 3 dimensional modeling of the observations, 360 degree rotation, extraction of sectional views, and comparative views, to name a few. This feature of the STG software is currently for educational purposes only.
Note (06/09/10): OpenGL compatibility issue. Vista 32 bit. Video card is NVIDIA GeForce 7900GS. Every time STG is run it gives an error: "Unhandled exception at 0x69736a3d in STG16.exe: 0xC0000005: Access violation reading location 0x000000a3."